Valve-gear



(No Model.) 2 Sheets-Sheet 1.

J. DICK.

VALVE GEAR.

No. 329,891. Patented Nov. 10, 1885.

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F i l I I l/VVEIVTOR WITNESSES By Attorney N. PETERS. Phmmho nu.Walhington. n. c.

(No Model.) '2-Sheets-Sheet2. J. DICK.

VALVE GEAR. No. 329,891. Patented Nov. 10, 1885..

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u M MMW J WITNESS/58 UNITED STATES ATENT OFFICE.

JOHN DICK, OF MEADVILLE, PENNSYLVANIA.

VALVE-GEAR.

SPECIFICATION forming part of Letters Patent No. 329,891, dated November10, 1885.

Application filed May 4, 1885. Serial No. 164,323. (No model.)

To all whom it may concern:

Be it known that I, JOHN DICK, of Meadville, State of Pennsylvania, haveinvented certain new and useful Improvements in Valve- Gear forSteanrEngines; and I do hereby de clare that the following is a full,clear, and exact description of the invention, which will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification, and in which- Figure l is a side elevation of theflangeplate fastened on the crank-shaft and carrying the adjustableeccentric. Fig. 2 is a sec tional end elevation of the flange-plate andadjustable eccentric. Fig. 3 is a side elevation of the adjustableeccentric and strap as fixed on the carrying flange plate secured oncrank-shaft. Fig. 4c is a side elevation of the eccentric carried on awheel with adjustable device for altering the cut-off when at work. Fig.5 is an end elevation showing the wheel carrying the eccentric on enginecrankshaft.

Like letters indicate like parts in all the figures.

My invention relates to that class of steamengines having one ordinaryslide valve worked by a single eccentric the cut-off of which is inaccordance with the amount oflap placed on the valve. Heretofore toalter the point of cut-off in a single-valve engine it is requisite totake off the valve-box cover and add or diminish the lap on the valve.

The object of my invention is to make an adjustable cut-off engine bythe use of one eccentric and one valve, instead of the additional use ofan extra valve, stuffing-box, and eccentric connections requisite towork a cutoff valve in a steam-engine, and to further provide forallowing the cut-off to be adj ustable when the engine is at work.

In embodying my invention I employ the following instrumentalities.Referring to the drawings, A represents the flange plate or wheelfastened on crank-shaft for carrying the eccentric and on which it ismoved. B is the eccentric, which is loose on the shaft and made to slidein a horizontal line between the projections A, and which is fastened tothe flangeplate by the bolt 0. The eccentric is moved across the face ofthe flange-plate by means of the screw D. When it is desired to changethe point of cut off, the bolt Ois loosened, and by turning the screw Dthe eccentric can be moved across the shaft. The same operation isperformed by eccentric being held in position without the bolt 0 in thewheel A by the dovetailed slides A and to provide means for moving thescrew the star-wheel E is fastened on the screw D,-the arm F projectingfrom the engine-bed for the purpose of supporting the slide G. The pin His placed in the slide G for the purpose of holding the slide in itsplace. The handle J, bywhich the slide is moved, and the two pins K,fastened in slide G, are for the purpose of operating the starwheelsecured to the screw for moving the eccentric across the shaft.

In this device the pin H must be raised and the handle J taken hold of,so that the slide can be moved and either of the pins K brought incontact with star-wheel E, which will turn the screw in wheel A and movethe eccentric in a horizontal line across the shaft in either direction.

\Vhen the slide G is moved to the central position, both pins K will bethrown out of contact with the star-wheel E, and the pin H will keep theslide from moving out of position, and the screw D will hold theeccentric in position when at work.

Having described my invention, I claim and desire to secure by LettersPatent of the United States- In a steam-engine valvegear, thecombination of the wheel A", fastened on the crankshaft and providedwith the dovetailed projections A, with the eccentric, the. screw D,provided with the star-wheel E, the slide G, pin H, handle J, the pinsK, and the arm F, projecting from the engine-frame, substantially asshown and described.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN DICK.

. WVitnesses:

HENRY Gannon, THOS. SHIPLEY.

